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by kurthr
3254 days ago
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TIL - The Tundra (and Molniya) orbits are really interesting highly eccentric geosync (demigeosync) orbits that spend most of their time at high inclination perigee to allow clear line of sight transmission above 1 (or 2 locations) on Earth. This is useful since geostationary satellites are low angle at high latitudes and more difficult to launch. They are almost always at 63 degrees to avoid orbit perturbation due to gravitational anomalies, but still have to pass through the Van Allen radiation belts 2 (or 4) times per day. https://en.wikipedia.org/wiki/Tundra_orbit https://en.wikipedia.org/wiki/Molniya_orbit |
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